In Many Settings: Performs skilled analysis and repair of equipment, systems and vehicles; Leads others in highly skilled fabrication or modifications of existing or proposed equipment, facilities, systems or their components from verbal directions, sketches, plans, engineering drawings or technical references; Inspects, services and maintains assigned tools, equipment and vehicles; Performs quality control analysis on equipment or supported systems for proper functioning and performs remedial actions necessary to assure optimum operations; Inspects, approves or certifies work of others (if certified or authorized to do so); Maintains comprehensive activity, operations, service and usage records on supported vehicles, equipment and systems; Prepares estimates for unique or complex operations, maintenance and special projects from rough sketches and engineering plans or drawings, and documents use and expenditure of materials, supplies and equipment; Prepares sketches and drawings for work proposed or in-progress to communicate needed information to supervisors, subordinates and contractors; Coordinates own or work-unit activities with other work-units, agencies or contractors to assure optimal use of available resources and to minimize disruptions of service or support; Monitors contractor performance (including contractor-supplied goods and services); Stores, handles, uses and disposes of hazardous materials required, encountered or generated in work activities. Physical/Sensory Requirements: Some positions require the ability to: lift and carry up to seventy-five pounds; safely operate assigned vehicles and other powered equipment; work in extremes of heat, humidity, dust, cold; safely wear required safety clothing/equipment; work with on in the presence of obnoxious odors; work with noxious or potentially hazardous chemicals, compounds or products; ascend and descend ladders and stairs to reach and work upon elevated or below-grade work platforms and job sites; differentiate between colors.